There are several ways to pass a parameter into a method. Here is an example of a conventional approach to passing parameters into a method:

private static string MethodParams(string text, DateTime dateTime, Person person)
{
    return $"{text}:{dateTime}:{person}";
}

You can also utilize the in operator. The in keyword is employed to indicate that an argument is passed by reference but is read-only within the method. It is primarily employed in the context of passing parameters to methods. Here is an example:

private static string MethodParams(string text, in DateTime dateTime, Person person)
{
    return $"{text}:{dateTime}:{person}";
}

Lastly, you can also use ref readonly as shown in this example:

private static string MethodParams(string text, ref readonly DateTime dateTime, Person person)
{
    return $"{text}:{dateTime}:{person}";
}

I was curious about which of these methods is more performant.

Benchmark Results

As you can see in these results, all three of these methods of passing a parameter exhibit similar performance. Additionally, for these tests, all methods allocate around 8,400 bytes.

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